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Tamarugite

Year of discovery: 1889 (Cerros Pintados, Chile), 1994 (Japan)

Locality list: 6 localities of tamarugite

• NaAl(SO₄)₂,6H₂O
• [Na⁺][Al³⁺(H₂O)₆][(SO₄)₂]^4-

• Class: Sulfate - Hydrate
• Soluble in: Water
• Insoluble in: HCl
• Formed on dehydration of Mendozite.

• Al => Fe: Amarillite

• 6H₂O => 11H₂O: Mendozite
• 6H₂O => 12H₂O: Alum-(Na)

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3
• Density: 2.1

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=7.4, b=25.2, c=6.1, β=95.2